[BNX2]: Fix bug when rx ring is full
Fix the rx code path that does not handle the full rx ring correctly. When the rx ring is set to the max. size (i.e. 255), the consumer and producer indices will be the same when completing an rx packet. Fix the rx code to handle this condition properly. Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1656,23 +1656,30 @@ static inline void
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bnx2_reuse_rx_skb(struct bnx2 *bp, struct sk_buff *skb,
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u16 cons, u16 prod)
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{
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struct sw_bd *cons_rx_buf = &bp->rx_buf_ring[cons];
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struct sw_bd *prod_rx_buf = &bp->rx_buf_ring[prod];
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struct rx_bd *cons_bd = &bp->rx_desc_ring[cons];
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struct rx_bd *prod_bd = &bp->rx_desc_ring[prod];
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struct sw_bd *cons_rx_buf, *prod_rx_buf;
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struct rx_bd *cons_bd, *prod_bd;
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cons_rx_buf = &bp->rx_buf_ring[cons];
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prod_rx_buf = &bp->rx_buf_ring[prod];
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pci_dma_sync_single_for_device(bp->pdev,
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pci_unmap_addr(cons_rx_buf, mapping),
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bp->rx_offset + RX_COPY_THRESH, PCI_DMA_FROMDEVICE);
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prod_rx_buf->skb = cons_rx_buf->skb;
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bp->rx_prod_bseq += bp->rx_buf_use_size;
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prod_rx_buf->skb = skb;
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if (cons == prod)
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return;
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pci_unmap_addr_set(prod_rx_buf, mapping,
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pci_unmap_addr(cons_rx_buf, mapping));
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memcpy(prod_bd, cons_bd, 8);
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bp->rx_prod_bseq += bp->rx_buf_use_size;
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cons_bd = &bp->rx_desc_ring[cons];
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prod_bd = &bp->rx_desc_ring[prod];
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prod_bd->rx_bd_haddr_hi = cons_bd->rx_bd_haddr_hi;
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prod_bd->rx_bd_haddr_lo = cons_bd->rx_bd_haddr_lo;
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}
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static int
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@ -1699,14 +1706,19 @@ bnx2_rx_int(struct bnx2 *bp, int budget)
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u32 status;
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struct sw_bd *rx_buf;
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struct sk_buff *skb;
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dma_addr_t dma_addr;
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sw_ring_cons = RX_RING_IDX(sw_cons);
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sw_ring_prod = RX_RING_IDX(sw_prod);
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rx_buf = &bp->rx_buf_ring[sw_ring_cons];
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skb = rx_buf->skb;
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pci_dma_sync_single_for_cpu(bp->pdev,
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pci_unmap_addr(rx_buf, mapping),
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rx_buf->skb = NULL;
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dma_addr = pci_unmap_addr(rx_buf, mapping);
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pci_dma_sync_single_for_cpu(bp->pdev, dma_addr,
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bp->rx_offset + RX_COPY_THRESH, PCI_DMA_FROMDEVICE);
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rx_hdr = (struct l2_fhdr *) skb->data;
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@ -1747,8 +1759,7 @@ bnx2_rx_int(struct bnx2 *bp, int budget)
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skb = new_skb;
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}
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else if (bnx2_alloc_rx_skb(bp, sw_ring_prod) == 0) {
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pci_unmap_single(bp->pdev,
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pci_unmap_addr(rx_buf, mapping),
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pci_unmap_single(bp->pdev, dma_addr,
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bp->rx_buf_use_size, PCI_DMA_FROMDEVICE);
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skb_reserve(skb, bp->rx_offset);
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@ -1794,8 +1805,6 @@ reuse_rx:
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rx_pkt++;
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next_rx:
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rx_buf->skb = NULL;
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sw_cons = NEXT_RX_BD(sw_cons);
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sw_prod = NEXT_RX_BD(sw_prod);
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@ -3360,7 +3369,7 @@ bnx2_init_rx_ring(struct bnx2 *bp)
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val = (u64) bp->rx_desc_mapping & 0xffffffff;
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CTX_WR(bp, GET_CID_ADDR(RX_CID), BNX2_L2CTX_NX_BDHADDR_LO, val);
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for ( ;ring_prod < bp->rx_ring_size; ) {
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for (i = 0; i < bp->rx_ring_size; i++) {
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if (bnx2_alloc_rx_skb(bp, ring_prod) < 0) {
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break;
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}
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